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How far away would a heat gun be seriously unbearable?
I know that the military has researched vehicle mounted microwave or similar for crowd control.
BlisterBlaster?
In my experience a portable heat gun would be more of a psychological deterrent than an actual formidable device. A 8 inch 1/2" drill bit at high RPM would chew anything that touches it and it could be casually pushed effortlessly through squishy things, especially if you had an impact driver.
Realistically though, it's not practical for defense as it, again, forces you to be in physical contact with the assailant which is what you are trying to avoid.